Nothing quite compares to the hilarity of this.
There is an assumption that polar bears are the only animal to actively hunt humans (besides other humans). This is not true. They do not select humans as a choice food source, they just happen to wander into view of one and anything a polar bear sees it views of as food.
From the link above I quote:
a large (700-800) pound polar bear was seen approaching the sub. For about 40 minutes, the bear loitered around the subs rear rudder. It took a bite out of the rudder and, finding it inedible, stayed around the area of broken ice around the rudder for a while, apparently thinking a seal (the bears favorite food) might use it as an air hole. The bear finally left when he heard the noise of an approaching helicopter. When an officer first looked around outside via the periscope, he noted that his sub was being stalked by a hostile polar bear. . .The damage was said to be minor. . . It wasn’t designed as a polar bear snack, but that’s how life is sometimes.